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TPS7A45: About installed heat sink

Tsukui Yusuke
Guru 21930 points
Part Number: TPS7A45

Hi,

Customers are trying to implement a heat sink to TPS7A4501KTTR.
Could you check the attached file?

TPS7A4501KTTR.pdf

・Do you know the achievements and examples of connecting the heat sink to TPS7A4501KTTR ?
・Stress is applied to the package from above.
　In this case, please tell me how many newtons(N) the package can accept.

Could you give me your advice?

Best Regards,
Yusuke

  • 0
    TI__Guru 55940 points
    Hi Yusuke,

    Please allow us some time to look into your question as we are not commonly asked this kind of question.

    Please keep in mind that the primary heatsink for TPS7A45 is the GND plane of the PCB. Depending on your board layout and application conditions (Vin, Vout, Iout, ambient temperature, etc) you may not need the additional heatsink.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    Guru 21930 points

    Ryan-san,

    Thank you for your response and support.
    ”There is no installation example information of the type covering around the PKG.”
    "And TI does not recommend adhering the heat sink to the PKG to the device.”
    Is my understanding correct?

    Customers want to know information on TI's heat sink installation.
    Do you have information on installing a heat sink to LDO of the TO-263 package?

    Best Regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Guru 55940 points
    Hi Yusuke-san,

    We do not have a recommendation against adhering an external heatsink to the package; however, we generally do not add heatsinks in this manner in favor of methods of reducing the power dissipated withing the linear regulator. While an external heatsink in contact with the top of the package will help provide an additional thermal path to reduce the junction temperature, the primary thermal path for our linear regulators is through the GND plane of the PCB board.

    The external heatsink will benefit the system with contact. In order to improve the contact, a thermal paste should be applied between the heatsink and linear regulator package. While it is important to achieve contact, you should be careful not to have too much pressure on the package so that the die inside the package does not warp and change the performance of the regulator. We do not have a recommended maximum newtons of force for applying a heatsink for our linear regulators.

    Very Respectfully,
    Ryan